Submission #860899

#	Time	Username	Problem	Language	Result	Execution time	Memory
860899		alexdd	Gift (IZhO18_nicegift)	C++17	49 / 100	2077 ms	191960 KiB

nicegift

#include<bits/stdc++.h>
using namespace std;
#define int long long
int n,k;
int a[1000005];
priority_queue<pair<int,int>> pq;
vector<vector<int>> af;
set<pair<int,int>> vals;
int getmin()
{
    set<pair<int,int>>::iterator it = vals.begin();
    pair<int,int> cop = *it;
    return cop.first;
}
int getmax()
{
    set<pair<int,int>>::iterator it = vals.end();
    it--;
    pair<int,int> cop = *it;
    return cop.first;
}
signed main()
{
    ios_base::sync_with_stdio(0);cin.tie(0);
    cin>>n>>k;
    int sum=0;
    for(int i=1;i<=n;i++)
    {
        cin>>a[i];
        sum += a[i];
        pq.push({a[i],i});
    }
    if(sum%k!=0)
    {
        cout<<-1;
        return 0;
    }
    if(sum<=1000000)
    {
        while(!pq.empty())
        {
            if((int)pq.size()<k)
            {
                cout<<-1;
                return 0;
            }
            vector<int> sc;
            //cout<<1<<" ";
            for(int i=0;i<k;i++)
            {
                sc.push_back(pq.top().second);
                a[sc.back()]--;
                //cout<<sc.back()<<" ";
                pq.pop();
            }
            //cout<<"\n";
            for(auto x:sc)
                if(a[x]>0)
                    pq.push({a[x],x});
            af.push_back(sc);
        }
        cout<<af.size()<<"\n";
        for(int i=0;i<(int)af.size();i++)
        {
            cout<<1<<" ";
            for(int j=0;j<af[i].size();j++)
                cout<<af[i][j]<<" ";
            cout<<"\n";
        }
    }
    else
    {
        if(n%k==0 && 0)
        {
            cout<<n/k<<"\n";
            for(int i=1;i<=n;i+=k)
            {
                cout<<a[1]<<" ";
                for(int j=i;j<i+k;j++)
                    cout<<j<<" ";
                cout<<"\n";
            }
        }
        else if(a[1]%k==0 && 0)
        {
            cout<<n<<"\n";
            for(int i=1;i<=n;i++)
            {
                cout<<a[1]/k<<" ";
                for(int j=0;j<k;j++)
                    cout<<(i-1+j)%n + 1<<" ";
                cout<<"\n";
            }
        }
        else
        {
            int init = a[1];
            for(int i=1;i<=n;i++)
                vals.insert({a[i],i});
            while(!pq.empty())
            {
                if((int)pq.size()<k)
                {
                    cout<<-1;
                    return 0;
                }
                vector<int> sc;
                //cout<<1<<" ";
                for(int i=0;i<k;i++)
                {
                    sc.push_back(pq.top().second);
                    vals.erase({a[sc.back()],sc.back()});
                    a[sc.back()]--;
                    //cout<<sc.back()<<" ";
                    pq.pop();
                }
                //cout<<"\n";
                for(auto x:sc)
                {
                    if(a[x]>0)
                    {
                        pq.push({a[x],x});
                        vals.insert({a[x],x});
                    }
                }
                af.push_back(sc);
                if(pq.empty())
                    break;
                if(getmin()==getmax() && (int)pq.size()==n)
                {
                    if(init%(init-a[1])==0)
                    {
                        cout<<(int)af.size()<<"\n";
                        for(int i=0;i<(int)af.size();i++)
                        {
                            cout<<init/(init-a[1])<<" ";
                            for(int j=0;j<af[i].size();j++)
                                cout<<af[i][j]<<" ";
                            cout<<"\n";
                        }
                    }
                    else
                    {
                        cout<<-1;
                    }
                    return 0;
                }
            }
            cout<<af.size()<<"\n";
            for(int i=0;i<(int)af.size();i++)
            {
                cout<<1<<" ";
                for(int j=0;j<af[i].size();j++)
                    cout<<af[i][j]<<" ";
                cout<<"\n";
            }
        }
    }
    return 0;
}
/**
4 2
2 3 3 2
*/

Compilation message (stderr)

nicegift.cpp: In function 'int main()':
nicegift.cpp:66:26: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   66 |             for(int j=0;j<af[i].size();j++)
      |                         ~^~~~~~~~~~~~~
nicegift.cpp:137:42: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  137 |                             for(int j=0;j<af[i].size();j++)
      |                                         ~^~~~~~~~~~~~~
nicegift.cpp:153:30: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  153 |                 for(int j=0;j<af[i].size();j++)
      |                             ~^~~~~~~~~~~~~

• Subtask 1: 7 / 7
• Subtask 2: 11 / 11
• Subtask 3: 12 / 12
• Subtask 4: 19 / 19
• Subtask 5: 0 / 51